The P20A7: Reductant Injection Air Pressure Control Valve Performance fault code refers to an issue where the performance of the reductant injection air pressure control valve is below the expected level. This valve regulates the air pressure required for injecting diesel exhaust fluid (DEF) into the exhaust system, which is crucial for emissions control. Performance issues with this valve can result in inefficient DEF dosing, leading to higher emissions. The issue could stem from a malfunctioning valve, faulty control module, or wiring problems.
P20A7 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P20A7: Reductant Injection Air Pressure Control Valve Performance |
| Is it serious? | Yes, this can affect DEF delivery, leading to improper emissions control and triggering warning lights. |
| Possible causes | – Reductant injection air pressure control valve performance issues – Faulty control valve – Faulty control module |
| How to diagnose? | – Test the performance of the reductant injection air pressure control valve – Inspect for faults in the valve – Check the control module functionality |
P20A7 Meaning
The P20A7 code signals that the reductant injection air pressure control valve is not performing as required. This valve ensures the proper air pressure is applied to inject the DEF into the exhaust system. If the valve’s performance is compromised, it may lead to insufficient DEF injection, negatively affecting the emissions control system. The issue could be due to a faulty valve, malfunctioning control module, or related wiring problems.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the reductant system, which could provide further information on the issue. | OBD-II Scanner |
| Test the Performance of the Reductant Injection Air Pressure Control Valve | Use a diagnostic tool to test the valve’s performance and verify that it is operating within the manufacturer’s specifications. Replace if necessary. | Diagnostic Tool |
| Inspect the Valve for Faults | Visually inspect the reductant injection air pressure control valve for signs of malfunction, blockage, or wear that could impact its performance. | Flashlight, Safety Gloves |
| Check the Control Module Functionality | Test the control module that manages the valve to ensure it is sending the correct signals to operate the valve properly. | Diagnostic Tool |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to verify that the issue has been resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P20A7 code does not return. If it reappears, further diagnostics may be needed. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
